Code No.os Airflow Meter - Mazda MX-5 1990 Workshop Manual

F
SELF-DIAGNOSIS FUNCTION
CODE NO.OS AIRFLOW METER
STEP INSPECTION
1
Are there any poor connections in airflow meter circuit?
2 Is Code No.10 present at same time?
3
Is resistance of airflow meter OK?
Airflow meter Fully closed
n
I
Fully open
n
o
(LG/R)-F (G/Y) 200-600
I
20-1,000
D (LG/R)-C (B/LG) 200-400
4
Is there continuity between airflow meter connector and
ECU?
Airflow meter
ECU
o
(LG/R) 2K
F (G/Y) 20
5 Are EGU terminals 20 and 2K voltages OK?
(Refer to page F- 129)
Circuit Diagram
WATER
THERMOSENSOR
F-84
B/LG (F)
ECU
GY (F)
B/LG (F)
B/LG (F)
RIG
(F)
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
ACTION
Repair or replace connector
Go to next step
Check for open circuit in wiring from airflow me-
ter terminal-wire (B/LG) to ground
Go to next step
Go to next step
Replace airflow meter (Refer to page F-135)
Go to next step
Check for open circuit in wiring from airflow me-
ter to ECU
Replace ECU (Refer to page F-127)
Check for short circuit in wiring from airflow me-
ter to ECU
.-----_ _ .. FROM CIRCUIT-
OPENING RELAY
LG (F)
05UOFX-081
DIAGNOSIS CONNECTOR
LG (F)
LG/R LG
(F) (F)
B (F)
B (F)
AIRFLOW METER
05UOFX-082
-